
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>鼠标移过，改变图片路径</title>
    <style>
        body,ul,li{margin:0;padding:0;}
        body{background:#000;}
        img{border:0;border-radius:3px;}
        ul{list-style-type:none;}
        #box{width:212px;border:5px solid #fff;overflow:hidden;zoom:1;background:#fff;border-radius:5px;margin:10px auto;padding:0 0 3px 3px;}
        #box li,#box li img{float:left;width:50px;height:50px;}
        #box li{margin:3px 3px 0 0;}
        #box li.first{position:relative;}
        #box li.first,#box li.first img{width:156px;height:156px;}
        #box li.first div{position:absolute;top:0;left:0;width:156px;height:156px;display:none;opacity:0.5;filter:alpha(opacity=50);background:#fff url(img/loading.gif) 50% 50% no-repeat;}
    </style>
    <script type="text/javascript">
        window.onload = function ()
        {
            var oImg = document.getElementById("box").getElementsByTagName("img");
            var oDiv = document.getElementsByTagName("div")[0];
            for (var i = 1; i < oImg.length; i++)
            {
                oImg[i].onmouseover = function ()
                {
                    var img = new Image();
                    img.src = oImg[0].src = this.src.replace(/small/,"big");
                    oDiv.style.display = "block";
                    img.complete ? oDiv.style.display = "none" : (oImg[0].onload = function() {oDiv.style.display = "none"})
                }
            }
        };
    </script>
</head>
<body>
<ul id="box">
    <li class="first"><img src="img/big_1.jpg"><div></div></li>
    <li><a href="javascript:;"><img src="img/small_1.jpg"></a></li>
    <li><a href="javascript:;"><img src="img/small_2.jpg"></a></li>
    <li><a href="javascript:;"><img src="img/small_3.jpg"></a></li>
    <li><a href="javascript:;"><img src="img/small_4.jpg"></a></li>
    <li><a href="javascript:;"><img src="img/small_5.jpg"></a></li>
    <li><a href="javascript:;"><img src="img/small_6.jpg"></a></li>
    <li><a href="javascript:;"><img src="img/small_7.jpg"></a></li>
    <li><a href="javascript:;"><img src="img/small_8.jpg"></a></li>
    <li><a href="javascript:;"><img src="img/small_9.jpg"></a></li>
    <li><a href="javascript:;"><img src="img/small_10.jpg"></a></li>
    <li><a href="javascript:;"><img src="img/small_11.jpg"></a></li>
</ul>
</body>
</html>